The unexpectedness is the hottest part. I am sure that I have passed up opportunities to play because I need to have their intent telegraphed. Repeatedly... and generally with a cock flopped in my hand.
I had one masseur in London - 6'4", highly skilled and fit - who asked if he could add a body to body element to the massage. I think he was going through a dating dry patch and luckily I had contacted him on his rent.men number and not rentmasseur.com... Who was I to say no? Having 230 lbs of muscle and a gorgeous uncut cock pressed against me is still memorable and I came heavily.